Table Of Contents - LG KB770 Service Manual

1. INTRODUCTION ............................................... 5
1.1 Purpose ......................................................................5
1.2 Regulatory Information .................................................5
2. PERFORMANCE ............................................... 7
2.1 System Overview .........................................................7
2.2 Usable environment .....................................................8
2.3 Radio Performance ......................................................8
2.4 Current Consumption .................................................14
2.5 RSSI BAR ..................................................................14
2.6 Battery BAR ..............................................................14
2.7 Sound Pressure Level ................................................15
2.8 Charging ...................................................................16
3. TECHNICAL BRIEF ......................................... 17
3.1 General Description ...................................................17
3.2 GSM Mode ................................................................19
3.3 UMTS Mode ..............................................................23
3.4 LO generation and distribution circuits ........................26
3.5 Off-chip RF Components ............................................26
3.6 Digital Baseband (MSM6280) .....................................42
3.7 Subsystem(MSM6280) ..............................................44
3.8 Power Block ..............................................................51
3.9 External memory interface .........................................56
3.10 H/W Sub System .....................................................58
3.11 MAIN Features ........................................................74
4. TROUBLE SHOOTING ..................................... 79
4.1 RF Component Description .........................................79
4.2 WCDMA RF Signal Path .............................................80
4.3 GSM RF Signal Path ..................................................81
4.4 Checking VCTCXO Block ............................................82
4.5 Checking Front-End Module Block ..............................85
4.6 Checking WCDMA Block ............................................87
4.7 Checking GSM Block .................................................94
4.8 Checking Bluetooth Block ........................................100
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

Table Of Contents

4.9 Power ON Troubleshooting .......................................103
4.10 Charger Troubleshooting ........................................105
4.11 USB Troubleshooting ..............................................107
4.12 USIM Detect Troubleshooting ..................................108
4.13 Camera Troubleshooting ........................................110
4.14 Keypad Backlight Troubleshooting ...........................112
4.15 LCD Troubleshooting ..............................................114
4.16 Receiver Path ........................................................115
4.17 Headset path.........................................................117
4.18 Speaker phone path ..............................................119
4.19 Main microphone ..................................................121
4.20 Headset microphone ..............................................123
4.21 Vibrator .................................................................125
4.22 Checking DVB-T/H Block( The DVB-T/H function is for
KB770 ) ................................................................126
5. DOWNLOAD & S/W UPGRADE ..................... 131
6. BLOCK DIAGRAM ........................................ 146
7. CIRCUIT DIAGRAM ...................................... 157
8. BGA PIN MAP .............................................. 167
9. PCB LAYOUT ............................................... 171
10. CALIBRATION ............................................ 177
10.1 USAGE OF HOT-KIMCHI .........................................177
11. EXPLODED VIEW & REPLACEMENT
PART LIST ................................................. 181
11.1 EXPLODED VIEW ...................................................181
11.2 Replacement Parts ................................................183
11.3 Accessory .............................................................207
- 3 - LGE Internal Use Only